<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>首页</title>

</head>

<body class="df fdc bgce8">
  <!-- 主要内容 -->
  <main class="flex overflow">
    
    <button id="startBtn">开始训练</button>
    


  </main>

</body>

</html>